ARM: dts: stih410-family: Add missing reset_names for mmc1 node

reset-names property is needed to use the reset
API for STi sdhci driver.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/stih407-family.dtsi

@@ -563,6 +563,7 @@
 			clocks = <&clk_s_c0_flexgen CLK_MMC_1>,
 				 <&clk_s_c0_flexgen CLK_RX_ICN_HVA>;
 			resets = <&softreset STIH407_MMC1_SOFTRESET>;
+			reset-names = "softreset";
 			bus-width = <4>;
 		};